Design and characterization of a high-power ultrasound driver with ultralow-output impedance
Abstract
We describe a pocket-sized ultrasound driver with an ultralow-output impedance amplifier circuit (less than 0.05 Ω) that can transfer more than 99% of the voltage from a power supply to the ultrasound transducer with minimal reflections. The device produces high-power acoustical energy waves while operating at lower voltages than conventional ultrasound driving systems because energy losses owing to mismatched impedance are minimized. The peak performance of the driver is measured experimentally with a PZT-4, 1.54 MHz, piezoelectric ceramic, and modeled using an adjusted Mason model over a range of transducer resonant frequencies. The ultrasound driver can deliver a 100 Vpp (peak to peak) square-wave signal across 0-8 MHz ultrasound transducers in 5 ms bursts through continuous wave operation, producing acoustic powers exceeding 130 W. Effects of frequency, output impedance of the driver, and input impedance of the transducer on the maximum acoustic output power of piezoelectric transducers are examined. The small size, high power, and efficiency of the ultrasound driver make this technology useful for research, medical, and industrial ultrasonic applications.
Medium Power 40kHz Ultrasound Transducer Driver - This crystal controlled circuit drives a 40KHz piezoelectric transducer with a 30v peak to peak signal. (designed by David A. Johnson) PIC16F873 Ultrasonic Range Meter - (circuit / schematic design) Popular Electronics Ultrasound Detector - (electronic circuit). I am using 200KHz Ultrasonic transducers. According to the datasheet, this type of transducer can handle up to 500Vpp voltage. I have a TDC-gas evaluation board, which contains a booster, but it can only boost up 30Vpp. Below are few of my questions on boosting this transducer. On the evaluation board, it uses gate driver to boost square. When connect ultrasonic transducer amplifiers in parallel, a small resistor in series is needed to isolated the driver amps from one other. It is recommended to use 0.3Ω to 1.0Ω series resistance. Use larger resistance for higher output voltage.
Ultrasonic Transducer Sensor
Ultrasonic Transducer Sensor
Piezoelectric Ultrasonic Transducer
Ultrasonic Transducer Driver Circuit
- driver circuits;
- piezoceramics;
- piezoelectric transducers;
- power amplifiers;
- power supply circuits;
- ultrasonic devices;
- 84.30.Jc;
- 84.30.Le;
- Power electronics;
- power supply circuits;
- Amplifiers
Ultrasonic amplifier is a lab equipment that amplifies voltage signal at high frequencies. Unlike audio frequencies which are between 20Hz and 20kHz, ultrasonic-frequency are greater than 20kHz and into the hundreds kilo-Hertz and even MHz. Common ultrasonic amplifier applications are piezo transducer and sensor. Ultrasound sensors and transducers are generally capacitive. Western rope fonts. At high frequencies, these transducers impedance are low. They requires high-current amplifier to drive these transducers at these supersonic frequencies.
In addition to high current, piezo ultrasonic transducers require high voltage. Their required voltage is usually greater than 10V and up to 100V or higher. Most signal sources such as those function generator are less than 5V, but ultrasonic devices need higher voltage. Therefore a high-voltage ultrasonic power amplifier is needed. For example, a piezoelectric speaker needs an 50Vpp sine-wave, but a signal generator output is 5V maximum. Using the TS250 to amplify the signal source and it outputs high voltage and high current ultrasonic waveform that drives the piezo speaker. In summary the TS250 is an ideal ultrasonic amplifier driver.
